Insulating-joint



(NoModeL) W. O. DUNTLEY.

INSULATING JOINT.

No. 558,844. Patented Feb. 4, 1896.

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# 7792 @ZzazfZ ay ANDREW EGRAHAM. PHOTO-UTHQWASYHNGTOMD C UNITED STATES PATENT OFFICE.

\VILLIAM O. DUNTLEY, OF ST. LOUIS, MISSOURI. e

INSULATING-JOINT.

SPECIFICATION forming part of Letters Patent No. 553,844, dated February 4, 1896.

Application filed March 25, 1895. Serial No. 543,177. (No model.)

To aZZ whom it may concern:

Be it known that I, WILLIAM O. DUNTLEY, residing at the city of St. Louis, State of Missouri, have invented a new and useful Improvement in Insulating-Joints for Electric or Combination Fixtures, of which the following is a description, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to that class of insulating-joints adapted to be secured to the gaspipe, and to attach thereto a fixture which will be effectivelyinsulated from the said gaspipe.

The object of my invention is to provide a joint that will be compact in form, that can be taken apart, and that will afford perfect insulation.

My device possesses features of novelty hereinafter specifically pointed out and claimed.

Referring to the drawings, Figure I illustrates a side elevation of the device. Fig. II illustrates a vertical section through the line II II of Fig. I. Fig. III illustrates a bottom View of the upper section, 2. Fig. IV illustrates a top View of the lower section, 4. Fig. V illustrates a side elevation of the glass interior insulator and the surrounding fibrous insulator-washer.

1 represents the gas-pipe, which projects through the ceiling or wall. 2 is the upper section of the insulator screwed to said gaspipe 1.

3 is a hollow cone, attached to the bottom of the part 2.

4 is the lower section of the insulator.

5 is a collar, fitting over the shoulder of section 2 and screwing onto section 4.

6 is the gas-pipe to the chandelier or other fixture.

7 is I an insulating washer, composed of fibrous material, placed between the collar 5 and the sections 2 and 4. ,8 is a second insulating-washer, also of fibrous material, placed between the two sections.

9 is a glass interior insulator, provided with a central hollow projection, 10, at its bottom of less external diameter than the surrounding portion of the lower insulator=section, 4.

11 are ridges or lugs cast in the bottom of section. 2, and adapted to bear against and sink into the upper side of the fibrous insulatingwasher 8. 12 are like ridges or lugs, cast on section 4 adapted to sink into the lower part of said washer 8.

13 is a mica washer, placed between the upper section, 2, and the collar 5.

An especial feature of my invention is the interior glass insulator 9. This insulator has a flat top bearing against the flat bottom of the upper section, 2, and a fiat bottom bearing against the flat shoulders of lower section, 4. It is perforated through the center, .and into said perforation projects the cone 3 at the bottom of the upper section, 2. While at the bottom of the insulator 9 the cone 10 extends said perforation and conducts moisture out into pipe 0. These two cones together prevent the accumulation in the insulator-joint of moisture precipitated along the gas-pipe and draining toward the gas-fixture.

The bearing and strain are borne by the washers '7 and 8 into which the lugs 11 and 12 press. As the parts are bound together by screwing the collar 5 onto the section 4, the sections 2 and 4 are brought into contact with the flat top and bottom of insulator 9. This prevents the glass insulator from breaking, yet furnishes a perfect insulation. The parts are made gas-tight by previously painting them with a proper preparation for that purpose.

The moisture which condenses in all gaspipes drips through the cone 3, through the perforation of the insulator 9, through the cone 10 and into pipe 6. The glass insulator 10 prevents it from coming in contact with the fibrous washers and being absorbed thereby, and thus completing a connection between the two sections. This filling of the space between the two sections by a glass insulator of the form described is of special advantage when gasoline gas is used, because the incline necessary to drain back to the reservoir would, in ordinary constructions, al-

low moisture to come in contact with the fibrous washers, an evil which is avoided by my device. The use of glass as an insulator is of further advantage, as no gas can eat through it. This joint screws onto the gaspipe from the insulator and not from the collar. It is impossible,therefore,to geta groundcircuit by a contact with the joint.

\Vhile I have described washers 7 and S as composed of fibrous material, I do not limit myself to this construction, as it is evident any other suitable material may be used.

I claim as my invention and desire to secure by Letters Patent 1 In an insulating-joint,the combination of a section adapted to be secured to the gaspipe, a cone 3 at the lower end of the perforation therethrough, a second section insulated from said first section, a collar 5 to secure said two sections but in contact only with said second section insulator 13, interior glass insulator 9, having a drip-cone at the bottom of the perforation therethrough, and fibrous in- 

